navigation aid meaning in English

导航设施
导航系统
助航设备

Air navigation aids and electronics proficiency training
航空工程专精训练
Research on navigation aids telemetering and telecontrol system
航标遥测遥控系统的研究
Shanghai tailei navigation aids lighting source co . , ltd
上海泰蕾航标照明工程有限公司
Air traffic control and air navigation aids and electronics management
航管及航电督导管理训练
Inland waterway navigation aids
内陆水道助航标志

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